Method and apparatus for robust information coding
A digital signal is imperceptibly embedded into an input source signal, such as an image or video signal, to produce an encoded (sometimes termed "watermarked") signal. The principle of quasi-rotational symmetry is employed to facilitate detection of the embedded signal notwithstanding rotation of the encoded signal. Single or multiple degrees of symmetry can be employed. In another aspect, the digital signal is transformed to a frequency domain and phase-only filtered prior to its combination with the input source signal. In an illustrative embodiment, this filtering operation helps hide the digital signal within the source signal, and facilitates detection of the embedded digital signal even after the encoded signal has undergone various forms of corruption.
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1. In a method of steganographically processing an image signal to embed multi-bit information therein, an improvement comprising representing said information in the form of a plurality of partially overlapping quasi-rotationally symmetric patterns, and processing the image signal to imperceptibly enabled said plurality of partially overlapping quasi-rotationally symmetric patterns therein, wherein said quasi-rotational symmetry of the patterns facilitates detection of the multi-bit information from a resulting processed image signal if said processed image signal is corrupted by scaling or rotation operations.
2. The method of claim 1 in which each of said quasi-rotationally symmetric patterns encodes a single bit of information.
3. The method of claim 1 in which said plurality of quasi-rotationally symmetric patterns comprises at least four patterns, and centers of said plurality of patterns lie on a circle, thereby forming a rosette of patterns.
4. The method of claim 3 which includes processing the image signal to encode a plurality of said rosettes therein, wherein the rosettes are spaced across a representation of the image signal in a pixel domain so that a pattern of one rosette overlaps a pattern of another rosette.
5. The method of claim 4 in which patterns of one rosette overlap patterns of six other rosettes.
6. The method of claim 3 which includes providing at least one pattern in said rosette with a distinguishing feature to aid in distinguishing it from other pattern in said rosette during decoding.
7. The method of claim 1 which includes pre-processing the plurality of patterns prior to encoding the image signal therewith, said pre-processing including performing a fourier transform on said plurality of patterns to produce transformed data, and applying a filtering function to said transformed data.
8. The method of claim 7 in which the filtering function is rotationally symmetric within a spatial frequency domain.
9. The method of claim 7 in which the filtering function is phase-only.
10. The method of claim 1, further comprising storing the processed image signal on a physical medium.
11. The method of claim 10, wherein the physical medium comprises paper.
12. The method of claim 10, wherein the physical medium comprises a magnetic or electronic storage medium.
13. The method of claim 1 in which said patterns are wave patterns.
14. The method of claim 1 in which said quasi-rotationally symmetric patterns exhibit symmetry about more than one axis.
15. The method of claim 1 in which said quasi-rotationally symmetric patterns exhibit symmetry about more than two axes.
16. The method of claim 1 in which said image signal is represented as pixel data in a spatial image domain.
17. The method of claim 16 in which said processing includes adding a bit-mapped representation of said patterns to said pixel data.
18. The method of claim 1 in which the patterns exhibit said quasi-rotational symmetry when represented as pixel data in a spatial image domain.
19. The method of claim 1 in which the quasi-rotational symmetry of the patterns facilitates detection of the multi-bit information from the processed image signal if the processed image signal is corrupted by a rotation operation.
20. The method of claim 1 in which the quasi-rotational symmetry of the patterns facilitates detection of the multi-bit information from the processed image signal if the processed image signal is corrupted by a scaling operation.
21. The method of claim 1 in which the quasi-rotational symmetry of the patterns facilitates detection of the multi-bit information from the processed image signal by enabling re-registration of a corrupted, processed image signal by reference to said patterns.
22. A computer storage medium having instructions stored therein for causing a computer to perform the method of claim 1.
23. In a computer-implemented method of producing a steganographically encoded signal, the method including storing a representation of an input signal in a memory, and combining a multi-bit data signal with said input signal, the method being practiced using a programmed processor in conjunction with said memory, an improvement comprising:
- transforming the multi-bit data signal to produce a transformed signal in a complementary frequency domain;
- applying a phase-only filtering function to the transformed signal to produce a filtered signal; and
- combining the filtered signal with the representation of the input signal to effect steganographic encoding thereof, wherein the multi-bit data signal is hidden within the first signal without commercially impairing the value thereof.
24. The method of claim 23 in which the input signal is a set of image data represented as pixel data in a spatial image domain, and in which the multi-bit data signal comprises data corresponding to a plurality of quasi-rotationally symmetric patterns.
25. The method of claim 23 in which the combining step comprises adding the filtered signal to the representation of the input signal.
26. The method of claim 23 which includes representing the filtered signal as a group of pixels prior to combining same with the representation of the input signal.
27. A computer storage medium having instructions stored therein for causing said computer to perform the method of claim 23.
U.S. Patent Documents
|3665162||May 1972||Yamamoto et al.|
|3703628||November 1972||Philipson, Jr.|
|3809806||May 1974||Walker et al.|
|3838444||September 1974||Loughlin et al.|
|3922074||November 1975||Ikegami et al.|
|3971917||July 27, 1976||Maddox et al.|
|3982064||September 21, 1976||Barnaby|
|3984624||October 5, 1976||Waggener|
|4025851||May 24, 1977||Haselwood et al.|
|4225967||September 30, 1980||Miwa et al.|
|4230990||October 28, 1980||Lert, Jr. et al.|
|4231113||October 28, 1980||Blasbalg|
|4238849||December 9, 1980||Gassmann|
|4252995||February 24, 1981||Schmidt et al.|
|4313197||January 26, 1982||Maxemchuk|
|4367488||January 4, 1983||Leventer et al.|
|4379947||April 12, 1983||Warner|
|4380027||April 12, 1983||Leventer et al.|
|4389671||June 21, 1983||Posner et al.|
|4395600||July 26, 1983||Lundy et al.|
|4423415||December 27, 1983||Goldman|
|4425642||January 10, 1984||Moses et al.|
|4476468||October 9, 1984||Goldman|
|4528588||July 9, 1985||Lofberg|
|4532508||July 30, 1985||Ruell|
|4547804||October 15, 1985||Greenberg|
|4553261||November 12, 1985||Froessl|
|4590366||May 20, 1986||Rothfjell|
|4595950||June 17, 1986||Lofberg|
|4637051||January 13, 1987||Clark|
|4639779||January 27, 1987||Greenberg|
|4647974||March 3, 1987||Butler et al.|
|4654867||March 31, 1987||Labedz et al.|
|4660221||April 21, 1987||Dlugos|
|4663518||May 5, 1987||Borror et al.|
|4665431||May 12, 1987||Cooper|
|4672605||June 9, 1987||Hustig et al.|
|4675746||June 23, 1987||Tetrick et al.|
|4677435||June 30, 1987||Causse D'Agraives|
|4682794||July 28, 1987||Margolin|
|4703476||October 27, 1987||Howard|
|4712103||December 8, 1987||Gotanda|
|4718106||January 5, 1988||Weinblatt|
|4739377||April 19, 1988||Allen|
|4750173||June 7, 1988||Bluthgen|
|4765656||August 23, 1988||Becker et al.|
|4775901||October 4, 1988||Nakano|
|4776013||October 4, 1988||Kafri et al.|
|4805020||February 14, 1989||Greenberg|
|4807031||February 21, 1989||Broughton et al.|
|4811357||March 7, 1989||Betts et al.|
|4811408||March 7, 1989||Goldman|
|4820912||April 11, 1989||Samyn|
|4835517||May 30, 1989||van der Gracht et al.|
|4855827||August 8, 1989||Best|
|4864618||September 5, 1989||Wright et al.|
|4866771||September 12, 1989||Bain|
|4874936||October 17, 1989||Chanduer et al.|
|4876617||October 24, 1989||Best et al.|
|4879747||November 7, 1989||Leighton et al.|
|4884139||November 28, 1989||Pommier|
|4885632||December 5, 1989||Mabey et al.|
|4903301||February 20, 1990||Kondo et al.|
|4908836||March 13, 1990||Rushforth et al.|
|4908873||March 13, 1990||Philibert et al.|
|4920503||April 24, 1990||Cook|
|4921278||May 1, 1990||Shiang et al.|
|4939515||July 3, 1990||Adelson|
|4941150||July 10, 1990||Iwasaki|
|4943973||July 24, 1990||Werner|
|4943976||July 24, 1990||Ishigaki|
|4944036||July 24, 1990||Hyatt|
|4963998||October 16, 1990||Maufe|
|4965827||October 23, 1990||McDonald|
|4967273||October 30, 1990||Greenberg|
|4969041||November 6, 1990||O'Grady et al.|
|4972471||November 20, 1990||Gross et al.|
|4972476||November 20, 1990||Nathans|
|4979210||December 18, 1990||Nagata et al.|
|4993068||February 12, 1991||Piosenka|
|4996530||February 26, 1991||Hilton|
|5010405||April 23, 1991||Schreiber et al.|
|5027401||June 25, 1991||Soltesz|
|5036513||July 30, 1991||Greenblatt|
|5063446||November 5, 1991||Gibson|
|5073899||December 17, 1991||Collier et al.|
|5075773||December 24, 1991||Pullen et al.|
|5077608||December 31, 1991||Dubner|
|5077795||December 31, 1991||Rourke et al.|
|5079648||January 7, 1992||Maufe|
|5095196||March 10, 1992||Miyata|
|5113437||May 12, 1992||Best et al.|
|5144660||September 1, 1992||Rose|
|5148498||September 15, 1992||Resnikoff et al.|
|5150409||September 22, 1992||Elsner|
|5161210||November 3, 1992||Druyvesteyn et al.|
|5166676||November 24, 1992||Milheiser|
|5181786||January 26, 1993||Hujink|
|5185736||February 9, 1993||Tyrrell|
|5199081||March 30, 1993||Saito et al.|
|5200822||April 6, 1993||Bronfin et al.|
|5212551||May 18, 1993||Conanan|
|5213337||May 25, 1993||Sherman|
|5228056||July 13, 1993||Schilling|
|5243423||September 7, 1993||DeJean et al.|
|5245329||September 14, 1993||Gokcebay|
|5247364||September 21, 1993||Banker et al.|
|5253078||October 12, 1993||Balkanski et al.|
|5257119||October 26, 1993||Funada et al.|
|5259025||November 2, 1993||Monroe et al.|
|5267334||November 30, 1993||Normille et al.|
|5280537||January 18, 1994||Sugiyama et al.|
|5293399||March 8, 1994||Hefti|
|5295203||March 15, 1994||Krause et al.|
|5299019||March 29, 1994||Pack et al.|
|5305400||April 19, 1994||Butera|
|5315098||May 24, 1994||Tow|
|5319453||June 7, 1994||Copriviza et al.|
|5319724||June 7, 1994||Blonstein et al.|
|5319735||June 7, 1994||Preuss et al.|
|5325167||June 28, 1994||Melen|
|5327237||July 5, 1994||Gerdes et al.|
|5337362||August 9, 1994||Gormish et al.|
|5351302||September 27, 1994||Leighton et al.|
|5379345||January 3, 1995||Greenberg|
|5387941||February 7, 1995||Montgomery et al.|
|5394274||February 28, 1995||Kahn|
|5396559||March 7, 1995||McGrew|
|5398283||March 14, 1995||Virga|
|5404160||April 4, 1995||Schober et al.|
|5404377||April 4, 1995||Moses|
|5408542||April 18, 1995||Callahan|
|5418853||May 23, 1995||Kanota et al.|
|5422963||June 6, 1995||Chen et al.|
|5422995||June 6, 1995||Aoki et al.|
|5425100||June 13, 1995||Thomas et al.|
|5428606||June 27, 1995||Moskowitz|
|5428607||June 27, 1995||Hiller et al.|
|5432542||July 11, 1995||Thibadeau et al.|
|5432870||July 11, 1995||Schwartz|
|5446273||August 29, 1995||Leslie|
|5450122||September 12, 1995||Keene|
|5450490||September 12, 1995||Jensen et al.|
|5461426||October 24, 1995||Limberg et al.|
|5469506||November 21, 1995||Berson et al.|
|5473631||December 5, 1995||Moses|
|5479168||December 26, 1995||Johnson et al.|
|5481294||January 2, 1996||Thomas et al.|
|5488664||January 30, 1996||Shamir|
|5499294||March 12, 1996||Friedman|
|5515081||May 7, 1996||Vasilik|
|5524933||June 11, 1996||Kunt et al.|
|5530759||June 25, 1996||Braudaway|
|5532920||July 2, 1996||Hartrick et al.|
|5539471||July 23, 1996||Myhrvold et al.|
|5539735||July 23, 1996||Moskowitz|
|5541662||July 30, 1996||Adams et al.|
|5541741||July 30, 1996||Suzuki|
|5557333||September 17, 1996||Jungo et al.|
|5559559||September 24, 1996||Jungo et al.|
|5568179||October 22, 1996||Diehl et al.|
|5568570||October 22, 1996||Rabbani|
|5572010||November 5, 1996||Petrie|
|5572247||November 5, 1996||Montgomery et al.|
|5576532||November 19, 1996||Hecht et al.|
|5579124||November 26, 1996||Aijala et al.|
|5587743||December 24, 1996||Montgomery|
|5606609||February 25, 1997||Houser et al.|
|5614940||March 25, 1997||Cobbley et al.|
|5617148||April 1, 1997||Montgomery|
Foreign Patent Documents
|372 601||June 1990||EPX|
|411 232||February 1991||EPX|
|441 702||August 1991||EPX|
|493 091||July 1992||EPX|
|551 016 A1||July 1993||EPX|
|581 317||February 1994||EPX|
|605 208 A2||July 1994||EPX|
|629 972||December 1994||EPX|
|650 146 A1||April 1995||EPX|
|649 074 A1||April 1995||EPX|
|705 025 A2||April 1996||EPX|
|WO 89/08915||September 1989||WOX|
|WO 95/20291||July 1995||WOX|
|WO 9626494||August 1996||WOX|
|WO 9627259||September 1996||WOX|
|WO 9325038||December 1996||WOX|
- Tirkel et al, "Electronic Water Mark," DICTA-93, Macquarie University, Sydney, Australia, Dec., 1993, pp. 666-673. Koch et al., "Copyright Protection for Multimedia Data," Fraunhofer Institute for Computer Graphics, Dec. 16, 1994, 15 pages. "Access Control and COpyright Protection for Images, WorkPackage 8: Watermarking," Jun. 30, 1995, 46 pages. "Access Control and Copyright Protection for Images, WorkPackage 3: Evaluation of Existing Systems," Apr. 19, 1995, 68 pages. Boneh, "Collusion-Secure Fingerprinting for Digital Data," Department of Computer Science, Princeton University, 1995, 31 pages. Friedman, "The Trustworthy Digital Camera: Restoring Credibility to the Photographic Image," IEEE Transactions on Consumer Electronics, vol. 39, No. 4, Nov., 1993, pp. 905-910. "Cyphertech Systems: Introduces Digital Encoding Device to Prevent TV Piracy," Hollywood Reporter, Oct. 20, 1993, p. 23. "NAB--Cyphertech Starts Anti-Piracy Broadcast Tests," Newsbytes, NEW03230023, Mar. 23, 1994. Humphrey, "Stamping Out Crime," Hollywood Reporter, Jan. 26, 1994, p. S48. "Copyright Protection for Digital Images, Digital Fingerprinting from FBI," Highwater FBI brochure, 1995, 4 pages. "Access Control and COpyright Protection for Images, Conditional Access and Copyright Protection Based on the Use of Trusted Third Parties," 1995, 43 pages. Caronni, "Assuring Ownership Rights for Digital Images," Published in the Proceedings of `Reliable IT Systems,` VIS '95, HH. Bruggemann and W. Gerhardt-Hackl (Ed.), Vieweg Publishing Company, Germany, 1995, Jun. 14, 1994, 10 pages. Choudhury, et al., "Copyright Protection for Electronic Publishing over Computer Networks," IEEE Network Magazine, Jun. 1994, 18 pages. Moller, et al., "Rechnergestutzte Steganographie: Wie sie Funktioniert und warum folglich jede Reglementierung von Verschlusselung unsinnig ist," DuD, Datenschutz und Datensicherung, 18/6 (1994) 318-326. Pennebaker et al., JPEG Still Image Data Compression Standard, Chapter 3, "Aspects of the Human Visual System," pp. 23-27, 1993, Van Nostrand Reinhold, New York. Castro et al., "Registration of Translated and Rotated Images Using Finite Fourier Transforms," IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-9, No. 5, Sep. 1987, pp. 700-703. Weber et al., "Correlative Image Registration," Seminars in Nuclear Medicine, vol XXIV, No. 4, Oct., 1994, pp. 311-323. Toga et al., "Registration Revisited," Journal of Neuroscience Methods, 48 (1993), pp. 1-13. Sheng et al., "Experiments on Pattern Recognition Using Invariant Fourier-Mellin Descriptors," Journal of Optical Society of America, vol. 3, No. 6, Jun., 1986, pp. 771-776. Kurak et al., "A Cautionary Note On Image Downgrading," 1992, IEEE, pp. 153-159. Wagner, "Fingerprinting," 1983 IEEE, pp. 18-22. Nakamura et al., "A Unified Coding Method of Image and Text Data Using Discrete Orthogonal Transform," Systems and Computers in Japan, vol. 21, No. 3, 1990, pp. 87-92. Simmons, "Subliminal Channels; Past and Present," ETT, vol. 5, No. 4, Jul.-Aug. 1994, pp. 45-59. Nakamura et al., "A Unified Coding Method of Dithered Image and Text Data Using Micropatterns," Electronics and Communications in Japan, Part 1, vol. 72, No. 4, 1989, pp. 50-56. Tanaka, "Embedding the Attribute Information Into a Dithered Image," Systems and Computers in Japan, vol. 21, No. 7, 1990, pp. 43-50. Short, "Steps Toward Unmasking Secure Communications," International Journal of Bifurcation and Chaos, vol. 4, No. 4, 1994, pp. 959-977. Schreiber et al., "A Compatible High-Definition Television System Using the Noise-Margin Method of Hiding Enhancement Information," SMPTE Journal, Dec. 1989, pp. 873-879. Tanaka et al., "New Integrated Coding Schemes for Computer-Aided Facsimile," Proc. IEEE Int'l Conf. on Sys. Integration, Apr. 1990, pp. 275-281. Tanaka et al., "Embedding Secret Information Into a Dithered Multi-Level Image," Proc. IEEE Military Comm. Conf., Sept. 1990, pp. 216-220. Matsui et al., "Video-Steganography: How to Secretly Embed a Signature in a Picture," IMA Intellectual Property Project Proceedings, Jan. 1994, vol. 1, Issue 1, pp. 187-205. van Schyndel et al., "A Digital Watermark," IEEE International Conference on Image Processing, Nov. 13-16, 1994, pp. 86-90. Fitzgerald, "Invisible Digital Copyright ID," Editor & Publisher, Jun. 25, 1994, p. 62. "Foiling Card Forgers With Magnetic `Noise,`" Wall Street Journal, Feb. 8, 1994. Jain, "Image Coding Via a Nearest Neighbors Image Model," IEEE Transactions on Communications, vol. COM-23, No. 3, Mar. 1975, pp. 318-331. Arthur, "Digital Fingerprints Protect Artwork," New Scientist, Nov. 12, 1994, p. 24. Matthews, "When Seeing is Not Believing," New Scientist, Oct. 16, 1993, pp. 13-15. Bender et al., "Techniques for Data Hiding," Massachusetts Institute of Technology, Media Laboratory, Jan. 1995, 10 pages. Komatsu et al., "Authentication System Using Concealed Image in Telematics," Memoirs of the School of Science & Engineering, Waseda Univ., No. 52, 1988, pp. 45-60. Walton, "Image Authentication for a Slippery New Age," Dr. Dobb's Journal, Apr. 1995, pp. 18-26, 82-87. Port, "Halting Highway Robbery on the Internet," Business Week, Oct. 17, 1994, p. 212. Komatsu et al., "A Proposal on Digital Watermark in Document Image Communication and Its Application to Realizing a Signature," Electronics and Communications in Japan, Part 1, vol. 73, No. 5, 1990, pp. 22-33. Machado, "Announcing Stego 1.0a2, The First Steganography Tool for the Macintosh," Internet reference, Nov. 28, 1993, 3 pages. Brown, "S-Tools for Windows, Version 1.00, .COPYRGT.1994 Andy Brown, What is Steganography," Internet reference, Mar. 6, 1994, 6 pages. firstname.lastname@example.org, "Hide and Seek v. 4.0," Internet reference, Apr. 10, 1994, 3 pages. Arachelian, "White Noise Storm," Apr. 11, 1994, Internet reference, 13 pages. Schneier, "Digital Signatures, Cryptographic Algorithms Can Create Nonforgeable Signatures for Electronic Documents, Making Them Valid Legal Instruments" BYTE, Nov. 1993, pp. 309-312. Wise, "The History of Copyright, Photographers' Rights Span Three Centuries," PHOTO>Electronic Imaging, vol. 37, No. 6, 1994. Kassam, Signal Detection in Non-Gaussian Noise, Dowden & Culver, 1988, pp. 1-96. Brassil et al., Electronic Marking and Identification Techniques to Discourage Document Copying, Proceedings of INFOCOM '94 Conference on Computer, IEEE Commun. Soc Conference, Jun. 12-16, 1994, pp. 1278-1287. Sapwater et al., "Electronic Copyright Protection," PHOTO>Electronic Imaging, vol. 37, No. 6, 1994, pp. 16-21. Hecht, "Embedded Data Glyph Technology for Hardcopy Digital Documents," SPIE vol 2171, Feb. 1994, pp. 341-352. Roberts, "Picture Coding Using Pseudorandom Noise," IRE Trans. on Information Theory, vol. 8, No. 2, Feb., 1962, pp. 145-154. Bruyndonckx et al., "Spatial Method for Copyright Labeling of Digital Images," 1994, 6 pages. Gabor, et al., "Theory of Communication," J. Inst. Elect. Eng. 93, 1946, pp. 429-441. Bruyndonckx et al., Neural Network Post-Processing of Coded Images Using Perceptual Masking, 1994, 3 pages. Pickholtz et al., "Theory of Spread-Spectrum Communications--A Tutorial," Transactions on Communications, vol. COM-30, No. 5, May, 1982, pp. 855-884. Sklar, "A Structured Overview of Digital Communications--a Tutorial Review--Part I," IEEE Communications Magazine, Aug., 1983, pp. 1-17. Sklar, "A Structured Overview of Digital Communications--a Tutorial Review--Part II," IEEE Communications Magazine, Oct., 1983, pp. 6-21. Tirkel et al., "A Two-Dimensional Digital Watermark," 1995, 6 pages. Delaigle et al., "A Psychovisual Approach for Digital Picture Watermarking," 1995, 20 pages. Rindfrey, "Towards an Equitable System for Access Control and Copyright Protection in Broadcast Image Services: The Equicrypt Approach," Intellectual Property Rights and New Technologies, Proc. of the Conference, R. Oldenbourg Verlag Wien Munchen 1995, 12 pages. Sandford II, et al., "The Data Embedding Method," SPIE vol. 2615, Oct. 23, 1995, pp. 226-259. Tanaka et al., "A Visual Retrieval System with Private Information for Image Database," Proceeding International Conference on DSP Applications and Technology, Oct. 1991, pp. 415-421. JPEG Group's JPEG Software (release 4), FTP.CSUA.BEREKELEY.EDU /PUB/CYPHERPUNKS/APPLICATIONS/ JSTEG/JPEG.ANNOUNCEMENT.GZ, Jun. 7, 1993, 2 pages. Dautzenberg, "Watermarking Images," Department of Microelectronics and Electrical Engineering, Trinity College Dublin, 47 pages, Oct. 1994. Arazi, et al., "Intuition, Perception, and Secure Communication," IEEE Transactionson Systems, Man, and Cybernetics, vol. 19, No. 5, Sep./Oct. 1989, pp. 1016-1020.
Filed: May 8, 1995
Date of Patent: May 5, 1998
Assignee: Digimarc Corporation (Portland, OR)
Inventor: Geoffrey B. Rhoads (West Linn, OR)
Primary Examiner: Leo Boudreau
Assistant Examiner: Brian P. Werner
Law Firm: Klarquist Sparkman Campbell Leigh & Whinston
Application Number: 8/436,102
International Classification: G06T 900;